1. Alcoa’s, Kevin Anton, 2007. On Internet, 〈http://www.lme.com/oct07-article5.asp〉.
2. BP (annual). Statistical Review of World Energy, British Petroleum, London.
3. Brown, D., 2006. Crash of '86, Explorer. 〈http://www.aapg.org/explorer/2006/01jan/crash.cfm〉.
4. The measurement of resource rents—an application to Canadian nickel;Cairns;Resources Policy,1982
5. Changing structure in the world nickel industry;Cairns;The Antitrust Bulletin,1984